 |
| Posted: Fri Apr 13th, 2012 05:51 pm |
|
1st Post |
| Posted: Fri Apr 13th, 2012 06:59 pm |
|
2nd Post |
Scott Kneisel
Member
|
http://www.Kartsandparts.ca
Perry Blair has them for around $70 NOS
They are the later style with LH threads and no keyway but other than that they are the same crank.
The 45 takes the same crank as the Mc20, 30, & 40
I bought several from him.
Scott
|
|
Back To Top
|
| Posted: Sat Apr 14th, 2012 01:46 am |
|
3rd Post |
| Posted: Mon Apr 16th, 2012 03:23 am |
|
4th Post |
Alvin A. Klusman, Jr. (Torque)
Member
|
Hello All,
To be totally correct, a Mc-20 crank IS NOT the same as a Mc-30-40-45 crank.
Mc-20 cranks have a stroke of 1.625 the same as a Mc-10 Factory Stroker, 1.625
Same bore as a Mc-10, 2.125 and a displacement of 5.76 CID. McCulloch incresed
the stroke to 1.635 on the Mc-30 and later engines, and the bore to 2.165 for a
displacement of 6.05 CID. The Mc-30 and later cranks became service replacement cranks for the Mc-20.
Best Regards,
Torque
|
|
Back To Top
|
| Posted: Mon Apr 16th, 2012 03:31 am |
|
5th Post |
| Posted: Mon Apr 16th, 2012 01:35 pm |
|
6th Post |
Ted Johnson
Member
|
Hey, Good ol' Al Klusman comes to the rescue! Thank goodness for the guys like him and Tom Smith who have the good memory to keep this stuff straight. Heck, the only way I can remember what I had for breakfast this morning is to look at my beard in the mirror! Torque, If I can scrape up the money, I hope to pit next to you and Jack again at Fremont this year! Ted
|
|
Back To Top
|
| Posted: Mon Apr 16th, 2012 02:15 pm |
|
7th Post |
James Slaughter
Member
|
i see mac 20 30 40 45 and 45 d as 1.635 stroke. in a mac service guide that a friend has.i will seee if he can fax it too me.
|
|
Back To Top
|
| Posted: Tue Apr 17th, 2012 02:41 am |
|
8th Post |
Bill Mack
Member
|
From what I see in the MC parts books on rear 's site,the only odd engine out in the MC20 thru 45 is the MC40.All others in that group take the P/N 58128 crank.
|
|
Back To Top
|
| Posted: Tue Apr 17th, 2012 01:03 pm |
|
9th Post |
Ted Johnson
Member
|
Mc40 still takes the same crank. Don't know why there'd be a different P/N, but they're interchangable. TJ
|
|
Back To Top
|
| Posted: Sat Apr 21st, 2012 08:20 pm |
|
10th Post |
Alvin A. Klusman, Jr. (Torque)
Member
|
Mc-20 Cranks WERE 1.625 Stroke!!!!!!!!!!!!!!
The rules changed to 6.1 in 1962--McCulloch released the Mc-30 and Mc-7 in 1962
Bore increased 0.040 Stroke increased 0.010 in these engines.
This crankshaft was now legal in Mc-20's as was the use of oversize pistons.
The 1.635 crankshaft became a Mc-20 Service Replacement Part.
|
|
Back To Top
|
|
|
|
